They have engineers too mate. Removing mines is a part of their job.
Only snipers can see other snipers. With around 10 on the map you can counter that with at least 3 rounds of airstrikes.
Did they improve enemy combat values excluding the SS troops? It seems so hard to break into wave 100 now. Before that i reckon i can do it 50% of the time. (With 20 ribbons)
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